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e538dfda MN |
1 | /* |
2 | * Provides code common for host and device side USB. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License as | |
6 | * published by the Free Software Foundation, version 2. | |
7 | * | |
8 | * If either host side (ie. CONFIG_USB=y) or device side USB stack | |
9 | * (ie. CONFIG_USB_GADGET=y) is compiled in the kernel, this module is | |
10 | * compiled-in as well. Otherwise, if either of the two stacks is | |
11 | * compiled as module, this file is compiled as module as well. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
1c9af653 | 16 | #include <linux/of.h> |
e538dfda | 17 | #include <linux/usb/ch9.h> |
1c9af653 | 18 | #include <linux/usb/of.h> |
7009bdd7 FB |
19 | #include <linux/usb/otg.h> |
20 | ||
21 | const char *usb_otg_state_string(enum usb_otg_state state) | |
22 | { | |
23 | static const char *const names[] = { | |
24 | [OTG_STATE_A_IDLE] = "a_idle", | |
25 | [OTG_STATE_A_WAIT_VRISE] = "a_wait_vrise", | |
26 | [OTG_STATE_A_WAIT_BCON] = "a_wait_bcon", | |
27 | [OTG_STATE_A_HOST] = "a_host", | |
28 | [OTG_STATE_A_SUSPEND] = "a_suspend", | |
29 | [OTG_STATE_A_PERIPHERAL] = "a_peripheral", | |
30 | [OTG_STATE_A_WAIT_VFALL] = "a_wait_vfall", | |
31 | [OTG_STATE_A_VBUS_ERR] = "a_vbus_err", | |
32 | [OTG_STATE_B_IDLE] = "b_idle", | |
33 | [OTG_STATE_B_SRP_INIT] = "b_srp_init", | |
34 | [OTG_STATE_B_PERIPHERAL] = "b_peripheral", | |
35 | [OTG_STATE_B_WAIT_ACON] = "b_wait_acon", | |
36 | [OTG_STATE_B_HOST] = "b_host", | |
37 | }; | |
38 | ||
39 | if (state < 0 || state >= ARRAY_SIZE(names)) | |
40 | return "UNDEFINED"; | |
41 | ||
42 | return names[state]; | |
43 | } | |
44 | EXPORT_SYMBOL_GPL(usb_otg_state_string); | |
e538dfda | 45 | |
1494a1f6 FB |
46 | static const char *const speed_names[] = { |
47 | [USB_SPEED_UNKNOWN] = "UNKNOWN", | |
48 | [USB_SPEED_LOW] = "low-speed", | |
49 | [USB_SPEED_FULL] = "full-speed", | |
50 | [USB_SPEED_HIGH] = "high-speed", | |
51 | [USB_SPEED_WIRELESS] = "wireless", | |
52 | [USB_SPEED_SUPER] = "super-speed", | |
53 | }; | |
54 | ||
e538dfda MN |
55 | const char *usb_speed_string(enum usb_device_speed speed) |
56 | { | |
1494a1f6 | 57 | if (speed < 0 || speed >= ARRAY_SIZE(speed_names)) |
e538dfda | 58 | speed = USB_SPEED_UNKNOWN; |
1494a1f6 | 59 | return speed_names[speed]; |
e538dfda MN |
60 | } |
61 | EXPORT_SYMBOL_GPL(usb_speed_string); | |
62 | ||
d1e3d757 FB |
63 | const char *usb_state_string(enum usb_device_state state) |
64 | { | |
65 | static const char *const names[] = { | |
66 | [USB_STATE_NOTATTACHED] = "not attached", | |
67 | [USB_STATE_ATTACHED] = "attached", | |
68 | [USB_STATE_POWERED] = "powered", | |
69 | [USB_STATE_RECONNECTING] = "reconnecting", | |
70 | [USB_STATE_UNAUTHENTICATED] = "unauthenticated", | |
71 | [USB_STATE_DEFAULT] = "default", | |
72 | [USB_STATE_ADDRESS] = "addresssed", | |
73 | [USB_STATE_CONFIGURED] = "configured", | |
74 | [USB_STATE_SUSPENDED] = "suspended", | |
75 | }; | |
76 | ||
77 | if (state < 0 || state >= ARRAY_SIZE(names)) | |
78 | return "UNKNOWN"; | |
79 | ||
80 | return names[state]; | |
81 | } | |
82 | EXPORT_SYMBOL_GPL(usb_state_string); | |
83 | ||
1c9af653 MG |
84 | #ifdef CONFIG_OF |
85 | static const char *const usb_dr_modes[] = { | |
86 | [USB_DR_MODE_UNKNOWN] = "", | |
87 | [USB_DR_MODE_HOST] = "host", | |
88 | [USB_DR_MODE_PERIPHERAL] = "peripheral", | |
89 | [USB_DR_MODE_OTG] = "otg", | |
90 | }; | |
91 | ||
92 | /** | |
93 | * of_usb_get_dr_mode - Get dual role mode for given device_node | |
94 | * @np: Pointer to the given device_node | |
95 | * | |
96 | * The function gets phy interface string from property 'dr_mode', | |
97 | * and returns the correspondig enum usb_dr_mode | |
98 | */ | |
99 | enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np) | |
100 | { | |
101 | const char *dr_mode; | |
102 | int err, i; | |
103 | ||
104 | err = of_property_read_string(np, "dr_mode", &dr_mode); | |
105 | if (err < 0) | |
106 | return USB_DR_MODE_UNKNOWN; | |
107 | ||
108 | for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++) | |
109 | if (!strcmp(dr_mode, usb_dr_modes[i])) | |
110 | return i; | |
111 | ||
112 | return USB_DR_MODE_UNKNOWN; | |
113 | } | |
114 | EXPORT_SYMBOL_GPL(of_usb_get_dr_mode); | |
1494a1f6 FB |
115 | |
116 | /** | |
117 | * of_usb_get_maximum_speed - Get maximum requested speed for a given USB | |
118 | * controller. | |
119 | * @np: Pointer to the given device_node | |
120 | * | |
121 | * The function gets the maximum speed string from property "maximum-speed", | |
122 | * and returns the corresponding enum usb_device_speed. | |
123 | */ | |
124 | enum usb_device_speed of_usb_get_maximum_speed(struct device_node *np) | |
125 | { | |
126 | const char *maximum_speed; | |
127 | int err; | |
128 | int i; | |
129 | ||
130 | err = of_property_read_string(np, "maximum-speed", &maximum_speed); | |
131 | if (err < 0) | |
132 | return USB_SPEED_UNKNOWN; | |
133 | ||
134 | for (i = 0; i < ARRAY_SIZE(speed_names); i++) | |
135 | if (strcmp(maximum_speed, speed_names[i]) == 0) | |
136 | return i; | |
137 | ||
138 | return USB_SPEED_UNKNOWN; | |
139 | } | |
140 | EXPORT_SYMBOL_GPL(of_usb_get_maximum_speed); | |
141 | ||
1c9af653 MG |
142 | #endif |
143 | ||
e538dfda | 144 | MODULE_LICENSE("GPL"); |